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Why will the KC breakers not fit into the HCM interior?

Issue:
HCM interior cannot take KC circuit breakers

Product Line:
Panelboard, Circuit Breakers

Environment:
ILine Panelboard and Circuit Breakers

Resolution:
Size wise the KC will fit. However, the KC breaker needs a vented trim to allow the gases to escape on a high level fault. The HCM trim is not vented. But the Powerpact JJ and JL do not need the vented trim so they can be used.